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Fair Value of Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2023
Fair Value Disclosures [Abstract]  
Schedule of Fair Value And Carrying Values For Notes And Bonds Payable, Real Estate Notes Receivable, And Notes Receivable
The table below details the fair values and carrying values for notes and bonds payable and real estate notes receivable at June 30, 2023 and December 31, 2022.
 June 30, 2023December 31, 2022
Dollars in millionsCARRYING VALUEFAIR VALUECARRYING VALUEFAIR VALUE
Notes and bonds payable 1
$5,340.3 $5,107.5 $5,351.8 $5,149.6 
Real estate notes receivable 1
$151.5 $149.0 $99.6 $99.6 
1Level 2 – model-derived valuations in which significant inputs and significant value drivers are observable in active markets.